Excellent links guys, thanks..
In my case, we just sighted in the muzzleloader and it was touching holes at 50yds. it also has a scope so I think a scoped muzzleloader will give him much more of an advantage over a bead sight .410 when the buck fever starts the shakes.
Although, I must admit, we fired the .410 out to 50 yds using Brennke, Winchester, and Remington slugs using the bead sights and the gun performed better than I expected. It achieved a good grouping at 50 yds with all three cartridges but the Brennke's had the best groupings. If I was in a thick spot with bow ranges I would use the .410. It was light to carry, sufficiently accurate, and actually fun to shoot.